Average rent is $1,514, up from $1,260 a year agoSAN DIEGO (June 3, 2015) - The countywide vacancy rate for residential rental units now stands at 4.1 percent, a slight increase from Fall 2014, according to the San Diego County Apartment Association’s (SDCAA) Spring 2015 Vacancy and Rental Rate Survey. The vacancy rate — up from 2.3 percent last fall and 2.7 percent this time last year — was driven higher in part by rising supply from newly constructed units entering the local market. In Mission Valley, for example, the first phase of a 612-unit apartment community opened early this year. Other communities, in San Marcos, Kearny Mesa, Downtown and elsewhere, also have opened recently. Multiple military deployments early in 2015 may also have contributed to a higher vacancy rate.